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Free Online Slideshow Maker There are also some websites that offer free slide shows, but with the added feature of having a watermark. When you use this service, you could easily edit your slides, add sound tracks, and also change the color of the background. You could also download other free slide show software that you could use for creating more interesting ones. To make the best free online slideshow maker, you should first make sure that your computer has all the necessary programs and tools needed to create a great slide show. There are several free video converter tools that can be downloaded online.